Concrete-mixer.



Fig. 3

T. AHLBORN.

CONCRETE MXBR.

APPLICATION FILED MAY 24, 1912.

Patented Feb. 1 1, 1913.

2 SHEETS-SHEET 1.

www

Attorney.

T. AHLBORN.

CONCRETE MIXER. APPLIGATION FILED MAY 24, 1912.

1,052,993.. vFaten'el Feb. 11, 1913 y( 2 SHEETS-SHEET 2.

Attorney.

THEOTGRE AHLBGRN, 0F 1A.Vfi'lllBLOQ, OWA, ASSIGC'R TO V.THE WATERLOO CEMENT MACHINERY CORPORATION, 0F WATERLOO, OWA.

CONCRETE-MIXER.

Specification of Letters'latentf Patented Feb.. it, 1.913.

Application led May 24, 1912. Serial lilo. 699,522.

To all whom rf may concern:

Be it` known that Timooonn AnLnonN, a

, citizen of the United States of America, and

My invention relates to improvements in' concrete mixe-rs, and the object of my improvement to simplify and expedite the mixing operation, by securing a coaxial delivery drum in combination with the mixing drum, having turbinated or whirled blades adapted to receive and deliver into the mixing drum the dry umnixed materials or components of the concrete. This object I have accomplished by the means which are. here.- inafter described and claimed, and which are illustrated in the accompanying drawings, in which:

Figure l is a` vertical longitudinal axial section of my improved mixing-drum with its delivery drum attachment. rear elevation of the delivery drum, with the rear annular face thereof sectioned away. Fig. o is a front elevation of said delivery-drum, with its forward annular face sectioned away. K

Similar numerals of reference denote corresponding parts throughout the sev-eral views.

Referring first to Fig. l, this view shows the hollow cylindrical mixing-drum l having a rim-gear l5 thereabout adapted to be rotated with said drum by means of some prime-mover and a suitable power transmission device not shown. mounted on anti-friction wheels 6, and has in its front face an axialopening adapted to receive a. projecting chute '-l, the latter being supported by the forward uprights T of the machine-frame. To the inner end of said chute l is pivoted a swinging section 5, 'which may be tilted forward or back by meansl of a hand-lever and connections, to

either close the chute, or to direct the con-I tents of the drum outwardly through said chute as the drum rotates and the mixingblades drop their loads into said chute-section. This combined chute and its swinging section 5 are shown and separatel claimed by me in my co-pending application Serial Number 697,289.

Fig. 2 is a- The drum is The delivery-drum 2 is of a hollow cylindrical form, and secured coaxially to the rear face of the mixing-drum l with its forward axial opening coinciding with the rear axial opening of the mixing-drum'. The rear face of the drum 2 has an axial opening 1l of greater diameter than its forward opening 12, so that when unmixed. materials are dumped into the drum from a wheelbarrow over the transverse support le,

the materials will fall into the hollow of v the drum near its circumferential periphery, to be picked Aup by the turbinate delivery whirls or bodies 8 which are regularly arranged in a desired number around the axis of said drum.

The essence of this invention lies in the peculiar form and function of these turbiniform'blades. Each blade 8 has one end secured to and across the inner face of the circumferential wall of the drum by means of rivets 1G. From itssaid location of connection to the drum the said blade is twisted in such a way that it becomes whirled, forming a' conical trough whose delivery vertex is within the mixing-drum l not far from' the axis of the latter and lprotruding through the axial opening l2 of the drum 2. The blades S thus have their coned or troughed delivery ends grouped centrally about the axis of the drum l and are seated about. a cylinder 9 to which they are attached. The blades thus are adapted to deliver materials into the middle of the mixing-drum ina dry state, a certain amount of mixing taking place in the troughs of the blades as they rotate consonantly with the drum 2. lVater is conveyed into the center of the drum l by means of a pipe l0 which l is passed through the central bore of the cylinder 9, and is supported by some fixed struct-ure without the machine.

It will be seen that the peculiar whirled shape of the blades 8 taken together'with the bringing of their delivery ends to a center, causes them when the drum is rotated, to pick up and transport unmiXed materials into the center of the drum l as ra idly as received from without. The use o a hopper is therefore obviated, and the operation thus simplied and made more etlcient, besides conducing toa saving in the cost of manufacture.

laving described niy invention, what I claim as new, and defsirc to secure by Letters Patent, is: i

1.111 combination, a rotatable mixingdrum\provideil with axial inlet and outlet openings, and a delivery-drum secured thereto eoaxially and provided with inlet and outlet openings with its outlet opening in registration with the inlet openingI of the mixing-(train, said delivery-drinn containing a pluralityv of open whirled plates arranged annular-ly about 'its circumferential wall and adapted to project into and deliver into the interior o't said mixing-drinn through .'-zaiffl central registering openings.

ln combination, a rotatable mixingdruin provided with axial inlet and outlet openings, and a delivery-drum `Secured thereto eoaxially and provided with inlet and outlet openings4 with it` outlet opening in registration with the inlet open-ing of the n'iixing-i'lrun'i, said ilelivery'orum containing a plurality of open whirled plates arranged about its inner circumferential wall with their receiving ends attached to Said wall and their delivery ends brought toward and arrange( closely'together about .the axis ot the drums and proiected a conside'ablo distance through said registering openingsl to deliver into the mixing drinn approxiu'iately into the center thereof.

3. In eo1nbinat.ion,a rotatable mixingdruln provided with both axial inlet and outlet openings, a. delivery-drum secured thereto eoaxially and provided with both axial inlet and outlet openings with theoutlet ope-nin" in registration with the inlet opening ov the n'iixing-drluu, Said deliverydruin containing a plurality ot' open whirled turbiniforin bodies inclined from the circumferential wall toward and closely grouped about its axis and projectinfaT a considerable distance within the mixing-drum to deliver into the interior of said mixing'- druni, an axially orifced ringupo-n which the inwardly-directed delivery ends of said whirled plates are mounted and means for conveyinga liquidbetween the deliveryends of said bodies through the hollow otl said orifieed ring into said mixing-drum.

Signed at Waterloo, Iowa, this 7th day of May, 1912.

l THEODORE AHL'BORN. Witnesses:

RAY MOORE,

G. H. ANDREWS. 

